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  <div class="section" id="add-compile-definitions">
<span id="command:add_compile_definitions"></span><h1>add_compile_definitions<a class="headerlink" href="#add-compile-definitions" title="Permalink to this headline">¶</a></h1>
<p>Add preprocessor definitions to the compilation of source files.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_compile_definitions(</span><span class="nv">&lt;definition&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
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<p>Adds preprocessor definitions to the compiler command line for targets in the
current directory and below (whether added before or after this command is
invoked). See documentation of the <span class="target" id="index-0-prop_dir:COMPILE_DEFINITIONS"></span><a class="reference internal" href="../prop_dir/COMPILE_DEFINITIONS.html#prop_dir:COMPILE_DEFINITIONS" title="COMPILE_DEFINITIONS"><code class="xref cmake cmake-prop_dir docutils literal notranslate"><span class="pre">directory</span></code></a>
and <span class="target" id="index-0-prop_tgt:COMPILE_DEFINITIONS"></span><a class="reference internal" href="../prop_tgt/COMPILE_DEFINITIONS.html#prop_tgt:COMPILE_DEFINITIONS" title="COMPILE_DEFINITIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">target</span></code></a> <code class="docutils literal notranslate"><span class="pre">COMPILE_DEFINITIONS</span></code> properties.</p>
<p>Definitions are specified using the syntax <code class="docutils literal notranslate"><span class="pre">VAR</span></code> or <code class="docutils literal notranslate"><span class="pre">VAR=value</span></code>.
Function-style definitions are not supported. CMake will automatically
escape the value correctly for the native build system (note that CMake
language syntax may require escapes to specify some values).</p>
<p>Arguments to <code class="docutils literal notranslate"><span class="pre">add_compile_definitions</span></code> may use “generator expressions” with
the syntax <code class="docutils literal notranslate"><span class="pre">$&lt;...&gt;</span></code>.  See the <span class="target" id="index-0-manual:cmake-generator-expressions(7)"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#manual:cmake-generator-expressions(7)" title="cmake-generator-expressions(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-generator-expressions(7)</span></code></a>
manual for available expressions.  See the <span class="target" id="index-0-manual:cmake-buildsystem(7)"></span><a class="reference internal" href="../manual/cmake-buildsystem.7.html#manual:cmake-buildsystem(7)" title="cmake-buildsystem(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-buildsystem(7)</span></code></a>
manual for more on defining buildsystem properties.</p>
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